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Questions tagged [rescale]

155 questions
77
votes
11 answers

Resize image, maintain aspect ratio

I have an image which I resize: if((width != null) || (height != null)) { try{ // Scale image on disk BufferedImage originalImage = ImageIO.read(file); int type = originalImage.getType() == 0 ?…
Fofole
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47
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2 answers

SKLearn MinMaxScaler - scale specific columns only

I'd like to scale some (but not all) of the columns in a Pandas dataFrame using a MinMaxScaler. How can I do it?
lte__
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21
votes
5 answers

Automatic rescaling of an application on high-dpi Windows platform?

I'm writing a Qt application that needs to run on high-dpi Windows (192dpi instead of 96dpi). Unfortunately the Qt framework does not have support for high-dpi yet (at least on Windows), so my application and all its elements looks half the size it…
Robin Lobel
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10
votes
1 answer

define color gradient for negative and positive values scale_fill_gradientn()

R version 3.1.1 (2014-07-10) Platform: i386-w64-mingw32/i386 (32-bit) I am working on a heatmap with ggplot2() values from -1 to +1. I want to achieve that negative values have a bluish gradiend from darkblue(-1) to lightblue(-0.00000001) and the…
VDK
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7
votes
4 answers

Correct way to standardize/scale/normalize multiple variables following power law distribution for use in linear combination

I'd like to combine a few metrics of nodes in a social network graph into a single value for rank ordering the nodes: in_degree + betweenness_centrality = informal_power_index The problem is that in_degree and betweenness_centrality are…
Jacob Rigby
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6
votes
1 answer

skimage.transform.rescale changes datatype from uint8 to float64

When I use skimage.transform.rescale to reduce size of an image by 40% the datatype is converted from uint8 to float64. I can manually change the datatype but I don't want to have too many manual interventions in my code. Is there any rescaling…
Uğur Dinç
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6
votes
2 answers

.net Drawing.Graphics.FromImage() returns blank black image

I'm trying to rescale uploaded jpeg in asp.net So I go: Image original = Image.FromStream(myPostedFile.InputStream); int w=original.Width, h=original.Height; using(Graphics g = Graphics.FromImage(original)) { g.ScaleTransform(0.5f, 0.5f); ... //…
joox
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5
votes
2 answers

How can I scale an array to another length saving it's approximate values in R

I have two arrays with different lengths value <- c(1,1,1,4,4,4,1,1,1) time <- c(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15) How can I resize the value array to make it same length as the time array, saving it's approximate values ? approx() function…
Alexander.Iljushkin
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5
votes
1 answer

Zooming and loading very large TIFF file

I have a very large hi-res map which I want to use in an application (imagesize is around 80 mb). I would like to know the following: How can I load this image the best way possible? I know it will take some seconds to load the image (which is ok)…
Héctor van den Boorn
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4
votes
3 answers

Error in UseMethod("rescale") : no applicable method for 'rescale' applied to an object of class "c('haven_labelled', 'vctrs_vctr', 'double')"

I am getting the following error: Error in UseMethod("rescale") : no applicable method for 'rescale' applied to an object of class "c('haven_labelled', 'vctrs_vctr', 'double')" Here is my code for the plot: ggplot(data_q_agg3, aes(x = 'qmrcms', y…
Luke Thompson
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3
votes
3 answers

Rescaling Image in Windows Form

I have a set of points I want to show on a 2000x2000 canvas. Here is an example: "61.86, 83 - 61.79, 82.91 - 61.77, 82.77 - 61.92, 82.76 - 61.75, 82.7 - 61.79, 82.58 - 61.85, 82.46 - 61.79, 82.17 - 61.72, 81.88 - 61.61, 81.61 - 61.51, 81.33 -…
Patrick
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3
votes
1 answer

Rescale positive and negative numbers into [0, 1] and [-1, 0]

I have a data frame like this: Input_df <- data.frame(Enl_ID = c("INTS121410", "INTS175899", "INTS171428", "INTS156006", "INTS196136", "INTS114771" ), `CN4244` = c(5, 0, -0.4, -0.6, 10, 2), `CN4249` = c(10, -4, -10, -2, 6, 0), `CN4250` = c(40, 10,…
SUMIT
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3
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1 answer

Reshape a pandas DataFrame of (720, 720) into (518400, ) 2D into 1D

I have a DataFrame with shape: 720*720 2D. I wanna convert it to 1D dimension without changing its values. How can I do this using Pandas?
Kaveh P. Yousefi
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3
votes
1 answer

python - rescale a value between two numerical ranges

I am trying to convert a value, comprised in the range of two integers, to another integer comprised in an other given range. I want the output value to be the corresponding value of my input integer (respecting the proportions). To be more clear,…
Knak
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3
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2 answers

Scale KineticJS Stage with Browser Resize?

Recently discovered KineticJS as I've been trying to convert my Flash skills to HTML Canvas. It is an extremely impressive tool! Question: If I'm using a front-end like Bootstrap and I have a page with several divs that contain KineticJS-generated…
Mitch
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